Proton-Conducting Phosphosilicate Films Prepared Using Template for Pore Structure

Mesostructured HSO 3 -functionalized TiO 2 -P 2 O 5 sol-gel films prepared by evaporation induced self-assembly method with high proton conductivity

“…The high specific surface area and pore volume, together with the periodic order of the pore structure, can increase the proton conductivity of coating such as silica films [17,18]. Ordered films exhibit higher proton conductivity across the entire range of temperatures respecting to disordered films likely due to the relatively higher surface area and pore volume of the ordered thin-film [19].…”

“…Ordered films exhibit higher proton conductivity across the entire range of temperatures respecting to disordered films likely due to the relatively higher surface area and pore volume of the ordered thin-film [19]. Moreover, titania-phosphorus structure appears as a good alternative to enhance the adsorption of water molecules and to improve the proton conduction [20,21].…”

Proton Conductivity of Mesoporous Silica Incorporated with Phosphorus under High Water Vapor Pressures up to 150.DEG.C.

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Proton conduction occurs through surface adsorbed water and condensed water in pores. The water vapor condenses in pores through capillary condensation, and this occurs at lower water vapor pressures for smaller pores.…”

“…Therefore, an increase in the acidity of the material surface by introducing strong acids is effective to enhance water dissociation and proton conduction. 1,[5][6][7][8][9][10][11][12][13] The phosphoric 1,5-12 and sulfonic 13 acid groups are generally used for silica derived materials. In addition, strong acidity also contributes to retaining water molecules under low water vapor pressures.…”

“…The proton conductivities of mesoporous silica incorporated with phosphoric acid have been reported to be about 10 ࢬ3 Scm and at 80c C in 70ಚ RH. 11,12 However, there have been no report as yet on the proton conductivity of mesoporous silica incorporated with phosphoric acid under intermediate temperature region up to 150c C under saturated water vapor pressure.…”